MOONEY
M20V ACCLAIM ULTRA
SECTION VII
AIRPLANE AND SYSTEM DESCRIPTION
7 - 34
AIRPLANE FLIGHT MANUAL
ORIGINAL ISSUE - 03-16-2017
CABIN HEAT - Sonic nozzles extract high temperature bleed air immediately downstream from
the turbo compressor. A silencer quiets the bleed air flow. The nozzles are most effective at high
altitude and higher power settings because they rely on the compressor pressure ratio & speed
to create hot air flow.
A second source of hot air comes from a fresh (ram) air port on the aft engine baffle. This air is
routed through a heat exchanger located on the exhaust system. This source is most effective at
lower altitudes (warmer ambient temperature), higher speeds, and a wide range of cruise power
settings. Heat from this source is proportional to the turbo inlet temperature (TIT).
Both the hot bleed air and hot ram air are mixed together at the cabin heat valve. With the heat
valve closed unused hot air is exhausted into the cowling. Pulling the CABIN HEAT handle on the
center console AFT opens the cabin heat valve and closes the overboard outflow vent to provide
heated air to the cabin. Intermediate settings will provide intermediate amounts of cabin heat
flow and overboard outflow. If exhaust or oil fumes are detected in the cockpit immediately shut
the CABIN HEAT valve. Oil fumes may be a sign of impending turbo bearing failure or other oil
leakage into the induction system and should be investigated post flight.
OVER HEAD VENTILATION - Cabin overhead ventilating system works independently of cabin
heating and ventilating system. Fresh air enters a duct on dorsal fin and is controlled by individu-
al outlets above and between each seat. A master air vent control is located between the pilots &
co- pilots seat on the overhead panel. Rotating this control left or right will regulate the total air
flow available to all four overhead vents.
DEFROST - The windshield defrost system takes air from the cabin air distribution system and
distributes this over the windshield interior surface any time the CABIN HEAT and/or CABIN
VENT valves are opened. Pulling the DEFROST control full AFT decreases flow to the cabin,
turns the defroster blower ON and forces maximum air to flow through the defrost ducts.
PITOT PRESSURE & STATIC SYSTEM
A pitot tube, mounted on lower surface of the left wing, picks up ram air for air speed indication.
Two static ports, one on each side of the tailcone, supply static air pressure for the altimeter, the
airspeed indicator, and vertical speed indicator.
A pitot heater prevents pitot tube icing when flying in moisture- laden air. A pitot system drain
valve is located on the forward bottom skin of the left wing to fuselage fillet. A static system drain
valve is located on fuselage bottom skin below the left side, tailcone access door and is used to
drain moisture that might collect in static system lines. Excessive moisture in the system can
affect instrument readings.
An
alternate
static
pressure
source
valve
handle
is
installed
in
the
instrument
panel
below
the
pilot’s
control
wheel
shaft.
Alternate
static
air
pressure
is
sensed
from
within
the
cabin
and
will
affect
flight
instrument
readings.
Correction
charts
in
depict
the
difference
between
indicated
and
calibrated
instrument
readings
for
both
primary
and
alternate
static
systems
as-
suming
zero
instrument
error.
These
corrections
are
required
to
determine
true
airspeed.
The
true
airspeed
indicated
on
the
MFD
and
the
backup
airspeed
indicator
doesn’t
include
static
er-
ror
corrections.
STALL WARNING SYSTEM
The electrical stall warning system uses a vane- actuated switch, installed in left wing leading
edge, to energize stall warning horn located in the cabin. The stall warning switch is adjusted to
provide aural warning (VOICE ALERT) at 5 to 10 KIAS before actual stall is reached and will
remain on until aircraft flight attitude is changed toward a non- stalled condition.
-NOTE-
Do not attempt to adjust prestall warning speed by bending the vane. This part
has been heat treated and cannot be bent without damaging or breaking the
vane.
